Dorottya Gubán

Dorottya Gubán
Hungarian Academy of Sciences | HAS · Institute of Materials and Environmental Chemistry

PhD

About

30
Publications
3,715
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279
Citations

Publications

Publications (30)
Article
Large progress has been made in the last decades to reduce the carbon footprint of ammonia, which is an essential commodity of the food, chemical and energy industry. Apart from alternative routes for green feedstock production, such as hydrogen via electrolysis and nitrogen via solar thermochemical methods, alternatives are explored to replace the...
Conference Paper
Ammonia is one of the most-produced chemicals in the world. It is applied in the fertilizer industry, and nitrogen fertilizers are a necessity to feed the world's growing population. Due to the high energy demand of the Haber- Bosch ammonia synthesis process, and due to the energy-intensive production of its precursors hydrogen and nitrogen, this p...
Article
Ammonia is one of the most-produced chemicals in the world. It is applied in the fertilizer industry, and nitrogen fertilizers are a necessity to feed the world's growing population. Due to the high energy demand of the Haber- Bosch ammonia synthesis process, and due to the energy-intensive production of its precursors hydrogen and nitrogen, this p...
Presentation
Full-text available
Research on the combination of a PSA with a thermochemical cycle for pure nitrogen production.
Conference Paper
Production of ammonia from solar radiation air and water by thermochemical cycles.
Article
Full-text available
Conventional productions of large volume of hydrogen from fossil based resources continue to play a key role in the hydrogen economy. This paper recalls the contribution of these conventional technologies with new technological development and researches. Providing gradual integration of renewable solutions into large-scale production, some emergin...
Article
Apart from being a major feedstock for chemical production, hydrogen is also a very promising energy carrier for the future energy. Currently hydrogen is predominantly produced via fossil routes, but as green energy sources are gaining a larger role in the energy mix, novel and green production routes are emerging. The most abundant renewable hydro...
Article
Perovskites are excellent candidate materials as oxygen carriers in thermochemical processes. Due to their versatile composition, it is possible to fine-tune the perovskite’s properties. We present a method for the rational design of AMO3-δ perovskite solid solutions with two different species on the Msite in order to tune their redox behavior. To...
Article
The achievement of low oxygen partial pressures is beneficial in a number of applications, including the production of nitrogen for the Habor-Bosch process, one of the largest industrial chemical processes. It has been suggested in the literature that a redox cycle can be utilized for selective oxygen adsorption, with the potential for application...
Chapter
Full-text available
In the DüSol research project, the technology of sustainable fertilizer production is developed and demonstrated on the basis of solar thermal redox cycle processes. The focus is on the unexplored step of solar thermal air separation for the production of nitrogen. For this reaction, corresponding materials are identified by thermodynamic calculati...
Conference Paper
Full-text available
In the DüSol research project, the technology of sustainable fertilizer production is developed and demonstrated on the basis of solar thermal redox cycle processes. The focus is on the unexplored step of solar thermal air separation for the production of nitrogen. For this reaction, corresponding materials are identified by thermodynamic calculati...
Conference Paper
Perovskite solid solutions can be taylored for any thermochemical application Materials data can be retrieved online (Materials Project) Energy demand of thermochemical cycles can be analyzed in order to rank materials and find the most suitable material for given process parameters New materials for application in solar-thermochemical cycles can b...
Conference Paper
Perovskite solid solutions can be taylored for any thermochemical application Materials data can be retrieved online (Materials Project) Energy demand of thermochemical cycles can be analyzed in order to rank materials and find the most suitable material for given process parameters New materials for application in solar-thermochemical cycles can b...
Conference Paper
Converting heat from renewable sources into other forms of energy is considered an essential factor in the reduction of greenhouse gas emissions. For instance, high temperatures can be reached using concentrated solar power (CSP), and the thus-captured energy can be converted into so-called solar fuels via thermochemical processes. These consist of...
Conference Paper
Perovskites and their solid solutions are ideal candidate materials for application in two-step thermochemical cycles. By tuning their redox thermodynamics through composition adjustment, ideal perovskite materials can be designed for each type of application, such as fuels production or air separation. Within this presentation, it is shown how the...
Article
The preparation and the thorough characterization of 40 wt% Pt electrocatalysts supported on Ti(1−x)MxO2-C (M = W, Mo; x = 0.3–0.4) composite materials with enhanced stability and efficiency is presented. W-containing composite supported catalyst with different structural characteristics were compared in order to explore the influence of the nature...
Article
Full-text available
Alloy-type Sn–Pt/C electrocatalysts with the desired Pt/Sn = 3.0 ratio have been prepared by controlled surface reactions using home-made 20 wt% Pt/C (20Pt/C) catalysts with different Pt dispersion. Reaction conditions were found for the preparation of highly dispersed 20Pt/C catalysts by a modified NaBH4-assisted ethylene glycol reduction method u...
Article
Full-text available
2-Ferrocenyl-4H-benzo[e][1,3]thiazine and its 6,7-dimethoxy derivative were prepared by a Bischler–Napieralski-type annulation of the Mannich adducts of ferrocenecarboxamide, formaldehyde, and the corresponding thiophenol. A more efficient synthetic pathway, comprising a directed lithiation/iodination sequence followed by standard functional-group...
Article
Alloy-type Sn-Pt/C electrocatalysts with desired Pt/Sn = 3.0 ratio have been prepared using commercial 20 wt.% Pt/C (20Pt/C (Q: Quintech)) and home-made 20Pt/C (H) catalysts by means of Controlled Surface Reactions. According to in situ XPS and in situ XRD studies the exclusive incorporation of Sn onto the Pt sites was achieved resulting in exclusi...
Article
Ti-based electroconductive mixed oxides were deposited onto activated carbon by using three differentsol–gel-based multistep synthesis routes. As demonstrated by X-ray diffraction, high crystallinity of thetungsten-loaded rutile was achieved by a sequence of annealing in inert atmosphere at 750◦C and ashort reductive treatment at 650◦C. Formation o...
Article
Full-text available
In this contribution the preparation and the thorough characterization of a novel electrocatalyst support material consisting of a composite of Ti0.7W0.3O2 mixed oxide and activated carbon is presented. A sol-gel based synthesis method optimized for depositing rutile TiO2 with high level of isovalent tungsten incorporation onto activated carbon was...
Article
Full-text available
Alloy-type Sn–Pt/C electrocatalysts with Pt/Sn = 1.8–3.0 ratios and exclusive Sn–Pt interaction have been prepared by means of controlled surface reactions (CSRs). As demonstrated by XRD, the incorporation of Sn onto Pt/C was achieved satisfactorily yielding a near-stoichiometric fcc Pt3Sn alloy phase along with a certain amount of the Pt(1 - x)Snx...
Article
Full-text available
A novel wet chemical etching process has been developed for the construction of multisite silicon-based neural interfaces. The fabricated probe shaft is 280μm wide, 80μm thick and 7mm long. The current probe is equipped with 24 square-shaped platinum recording sites of 30μm×30μm. The applied combination of wet chemical etching steps for the formati...

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